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Sixdenier L, Baffou G, Tribet C, Marie E. Quantitative Microscale Thermometry in Droplets Loaded with Gold Nanoparticles. J Phys Chem Lett 2023:11200-11207. [PMID: 38055870 DOI: 10.1021/acs.jpclett.3c02550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Gold nanoparticles (AuNPs) are increasingly used for their thermoplasmonic properties, i.e., their ability to convert light energy into heat through plasmon resonance. However, measuring temperature gradients generated at the microscale by assemblies of AuNPs remains challenging, especially for random 3D distributions of AuNPs. Here, we introduce a label-free thermometry approach, combining quantitative wavefront microscopy and numerical simulations, to infer the heating power dissipated by a 3D model system consisting of emulsion microdroplets loaded with AuNPs. This approach gives access to the temperature reached in the droplets under laser irradiation without the need for extrinsic calibration. This versatile thermometry method is promising for noninvasive temperature measurements in various 3D microsystems involving AuNPs as colloidal heat sources, including photothermal drug delivery systems.
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Affiliation(s)
- Lucas Sixdenier
- PASTEUR, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Guillaume Baffou
- Institut Fresnel, CNRS, Aix Marseille University, Centrale Marseille, 13013 Marseille, France
| | - Christophe Tribet
- PASTEUR, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Emmanuelle Marie
- PASTEUR, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
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2
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Abstract
Formation of aqueous-core polymer capsules exhibiting an upper critical solution temperature (UCST) was achieved using surfactant-polymer interfacial complexation in water-in-oil inverse emulsions. In fluorinated oil, Coulombic interactions between Krytox, an anionic oil-soluble surfactant, and a cationic poly(lysine) grafted with poly(acrylamide-co-acrylonitrile) enabled the formation of an adsorbed polymer shell at the surface of water droplets. The thermoresponsiveness of the polymer shell was assessed by fluorescence microscopy with and without the presence of nanoparticles, including gold particles. We show that, above the cloud point, polymers with a balanced fraction of UCST grafts form flat adlayers that (i) spontaneously entrap nanoparticles upon cooling and (ii) switch from fluid-like dynamics at high temperature to solid-like dynamics below the cloud point. This system offers a straightforward mean to prepare temperature-sensitive capsules in mild, biocompatible conditions and to concentrate nanoparticles (including nanoheaters) in their shell.
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Affiliation(s)
- Lucas Sixdenier
- P.A.S.T.E.U.R., Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Amélie Augé
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - Yue Zhao
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - Emmanuelle Marie
- P.A.S.T.E.U.R., Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Christophe Tribet
- P.A.S.T.E.U.R., Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
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3
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Hespel L, Dupré de Baubigny J, Lalanne P, de Beco S, Coppey M, Villard C, Humblot V, Marie E, Tribet C. Redox-Triggered Control of Cell Adhesion and Deadhesion on Poly(lysine)- g-poly(ethylene oxide) Adlayers. ACS Appl Bio Mater 2019; 2:4367-4376. [DOI: 10.1021/acsabm.9b00601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Louise Hespel
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Julien Dupré de Baubigny
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Pierre Lalanne
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Simon de Beco
- Laboratoire Physico Chimie, Institut Curie, PSL Université, Sorbonne Université, CNRS UMR168, F-75005 Paris, France
| | - Mathieu Coppey
- Laboratoire Physico Chimie, Institut Curie, PSL Université, Sorbonne Université, CNRS UMR168, F-75005 Paris, France
| | - Catherine Villard
- Laboratoire Physico Chimie, Institut Curie, PSL Université, Sorbonne Université, CNRS UMR168, F-75005 Paris, France
| | - Vincent Humblot
- Laboratoire Réactivité de Surface, Sorbonne Université, CNRS UMR 7197, 4 Place Jussieu, F-75005 Paris, France
| | - Emmanuelle Marie
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Christophe Tribet
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
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Maurel P, Loustaud-Ratti V, Carrier P, Marie E, Rousseau A, Debette-Gratien M, Silvain C, Causse X, Barbier L, Prémaud A, Salamé E. Effect of longitudinal exposure to tacrolimus on chronic kidney disease occurrence at one year post liver transplantation. J Hepatol 2018. [DOI: 10.1016/s0168-8278(18)30269-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/26/2023]
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Abstract
Immediately before adsorption to a horizontal substrate, sinking polymer-coated colloids can undergo a complex sequence of landing, jumping, crawling, and rolling events. Using video tracking, we studied the soft adhesion to a horizontal flat plate of micron-size colloids coated by a controlled molar fraction f of the poly(lysine)-grafted-poly(N-isopropylacrylamide) (PLL-g-PNIPAM) which is a temperature-sensitive polymer. We ramp the temperature from below to above T_{c}=32±1^{∘}C, at which the PNIPAM polymer undergoes a transition, triggering attractive interaction between microparticles and surface. The adsorption rate, the effective in-plane (x-y) diffusion constant, and the average residence time distribution over z were extracted from the Brownian motion records during last seconds before immobilization. Experimental data are understood within a rate-equations-based model that includes aging effects and includes three populations: the untethered, the rolling, and the arrested colloids. We show that preadsorption dynamics casts a characteristic scaling function α(f) proportional to the number of available PNIPAM patches met by soft contact during Brownian rolling. In particular, the increase of in-plane diffusivity with increasing f is understood: The stickiest particles have the shortest rolling regime prior to arrest, so that their motion is dominated by the untethered phase.
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Affiliation(s)
- Giuseppe Boniello
- École Normale Supérieure, Département de Chimie, UMR CNRS-ENS-UPMC 8640 PASTEUR, 24, rue Lhomond, F-75005 Paris, France
| | - Christophe Tribet
- École Normale Supérieure, Département de Chimie, UMR CNRS-ENS-UPMC 8640 PASTEUR, 24, rue Lhomond, F-75005 Paris, France
| | - Emmanuelle Marie
- École Normale Supérieure, Département de Chimie, UMR CNRS-ENS-UPMC 8640 PASTEUR, 24, rue Lhomond, F-75005 Paris, France
| | - Vincent Croquette
- École Normale Supérieure, Département de Physique and Département de Biologie, Laboratoire de Physique Statistique UMR CNRS-ENS 8550, 24, rue Lhomond, F-75005 Paris, France
| | - Dražen Zanchi
- École Normale Supérieure, Département de Chimie, UMR CNRS-ENS-UPMC 8640 PASTEUR, 24, rue Lhomond, F-75005 Paris, France.,Université de Paris 7 Denis Diderot, 5 rue Thomas Mann, 75013 Paris, France
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Dalier F, Dubacheva GV, Coniel M, Zanchi D, Galtayries A, Piel M, Marie E, Tribet C. Mixed Copolymer Adlayers Allowing Reversible Thermal Control of Single Cell Aspect Ratio. ACS Appl Mater Interfaces 2018; 10:2253-2258. [PMID: 29314825 DOI: 10.1021/acsami.7b18513] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Dynamic guidance of living cells is achieved by fine-tuning and spatiotemporal modulation on artificial polymer layers enabling reversible peptide display. Adjustment of surface composition and interactions is obtained by coadsorption of mixed poly(lysine) derivatives, grafted with either repellent PEG, RGD adhesion peptides, or T-responsive poly(N-isopropylacrylamide) strands. Deposition of mixed adlayers provides a straightforward mean to optimize complex substrates, which is here implemented to achieve (1) thermal control of ligand accessibility and (2) adjustment of relative adhesiveness between adjacent micropatterns, while preserving cell attachment during thermal cycles. The reversible polarization of HeLa cells along orthogonal stripes mimics guidance along natural matrices.
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Affiliation(s)
- F Dalier
- PASTEUR, Département Chimie, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Université Paris 06, CNRS , 75005 Paris, France
| | - G V Dubacheva
- PASTEUR, Département Chimie, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Université Paris 06, CNRS , 75005 Paris, France
| | - M Coniel
- PASTEUR, Département Chimie, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Université Paris 06, CNRS , 75005 Paris, France
| | - D Zanchi
- PASTEUR, Département Chimie, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Université Paris 06, CNRS , 75005 Paris, France
- Université de Paris 7 Denis Diderot , 5 rue Thomas Mann, 75013 Paris, France
| | | | | | - E Marie
- PASTEUR, Département Chimie, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Université Paris 06, CNRS , 75005 Paris, France
| | - C Tribet
- PASTEUR, Département Chimie, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Université Paris 06, CNRS , 75005 Paris, France
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Alberti N, Marie E, Cuinet M, Pontarollo G, Crombe A, Vignoli P. Uniform and diffuse fatty replacement of the pancreas revealing cystic fibrosis in a 48-year-old man: CT findings. Diagn Interv Imaging 2016; 98:365-366. [PMID: 27765514 DOI: 10.1016/j.diii.2016.05.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 05/31/2016] [Accepted: 05/31/2016] [Indexed: 10/20/2022]
Affiliation(s)
- N Alberti
- Service de radiologie, centre hospitalier Alpes-Leman, 558, route de Findrol, 74130 Contamine-sur-Arve, France.
| | - E Marie
- Service de radiologie, centre hospitalier Alpes-Leman, 558, route de Findrol, 74130 Contamine-sur-Arve, France
| | - M Cuinet
- Service de radiologie, centre hospitalier Alpes-Leman, 558, route de Findrol, 74130 Contamine-sur-Arve, France; Service d'imagerie médicale, centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France
| | - G Pontarollo
- Service de radiologie, centre hospitalier Alpes-Leman, 558, route de Findrol, 74130 Contamine-sur-Arve, France
| | - A Crombe
- Service d'imagerie médicale, institut Bergonié, 229, cours de l'Argonne, 33076 Bordeaux, France
| | - P Vignoli
- Service de radiologie, centre hospitalier Alpes-Leman, 558, route de Findrol, 74130 Contamine-sur-Arve, France
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Dalier F, Eghiaian F, Scheuring S, Marie E, Tribet C. Temperature-Switchable Control of Ligand Display on Adlayers of Mixed Poly(lysine)-g-(PEO) and Poly(lysine)-g-(ligand-modified poly-N-isopropylacrylamide). Biomacromolecules 2016; 17:1727-36. [DOI: 10.1021/acs.biomac.6b00136] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- F. Dalier
- Ecole Normale
Supérieure-PSL Research University, Dpt Chimie, Sorbonne Universités
- UPMC Univ. Paris 06, CNRS UMR 8640, 24 rue Lhomond, 75005 Paris, France
| | - F. Eghiaian
- U1006 INSERM,
Aix-Marseille Université, Parc Scientifique et Technologique
de Luminy, 163 av. de Luminy, 13009 Marseille, France
| | - S. Scheuring
- U1006 INSERM,
Aix-Marseille Université, Parc Scientifique et Technologique
de Luminy, 163 av. de Luminy, 13009 Marseille, France
| | - E. Marie
- Ecole Normale
Supérieure-PSL Research University, Dpt Chimie, Sorbonne Universités
- UPMC Univ. Paris 06, CNRS UMR 8640, 24 rue Lhomond, 75005 Paris, France
| | - C. Tribet
- Ecole Normale
Supérieure-PSL Research University, Dpt Chimie, Sorbonne Universités
- UPMC Univ. Paris 06, CNRS UMR 8640, 24 rue Lhomond, 75005 Paris, France
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9
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Malinge J, Mousseau F, Zanchi D, Brun G, Tribet C, Marie E. Tailored stimuli-responsive interaction between particles adjusted by straightforward adsorption of mixed layers of Poly(lysine)-g-PEG and Poly(lysine)-g-PNIPAM on anionic beads. J Colloid Interface Sci 2016; 461:50-55. [DOI: 10.1016/j.jcis.2015.09.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 09/01/2015] [Accepted: 09/06/2015] [Indexed: 11/17/2022]
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10
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Wu M, Forero Ramirez LM, Rodriguez Lozano A, Quémener D, Babin J, Durand A, Marie E, Six JL, Nouvel C. First multi-reactive dextran-based inisurf for atom transfer radical polymerization in miniemulsion. Carbohydr Polym 2015; 130:141-8. [DOI: 10.1016/j.carbpol.2015.05.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 05/05/2015] [Indexed: 11/29/2022]
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Affiliation(s)
- Rudy Covis
- CNRS, LCPM, FRE 3564; Nancy F-54001 France
- Université de Lorraine, LCPM, FRE 3564; Nancy F-54001 France
| | - Emmanuelle Marie
- CNRS, LCPM, FRE 3564; Nancy F-54001 France
- Université de Lorraine, LCPM, FRE 3564; Nancy F-54001 France
| | - Alain Durand
- CNRS, LCPM, FRE 3564; Nancy F-54001 France
- Université de Lorraine, LCPM, FRE 3564; Nancy F-54001 France
| | - Christophe Baravian
- CNRS, LEMTA, UMR 7563; Nancy F-54001 France
- Université de Lorraine, LEMTA, UMR 7563; Nancy F-54001 France
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Sun J, Jia L, Emond M, Li MH, Marie E, Jullien L, Tribet C. Photocontrolled Ionization in the Corona of Rodlike Assemblies of Diblock Copolymers. Macromolecules 2014. [DOI: 10.1021/ma402591y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jing Sun
- Ecole
Normale Supérieure, Département de Chimie, UMR8640 CNRS-ENS-UPMC, 24 rue Lhomond, F-75005 Paris, France
| | - Lin Jia
- Institut
Curie, Centre de Recherche, Laboratoire Physico-Chimie Curie, UMR 168 CNRS-IC-UPMC, 26 rue d’Ulm, F-75248 Paris, France
| | - Matthieu Emond
- Ecole
Normale Supérieure, Département de Chimie, UMR8640 CNRS-ENS-UPMC, 24 rue Lhomond, F-75005 Paris, France
| | - Min-Hui Li
- Institut
Curie, Centre de Recherche, Laboratoire Physico-Chimie Curie, UMR 168 CNRS-IC-UPMC, 26 rue d’Ulm, F-75248 Paris, France
| | - Emmanuelle Marie
- Ecole
Normale Supérieure, Département de Chimie, UMR8640 CNRS-ENS-UPMC, 24 rue Lhomond, F-75005 Paris, France
| | - Ludovic Jullien
- Ecole
Normale Supérieure, Département de Chimie, UMR8640 CNRS-ENS-UPMC, 24 rue Lhomond, F-75005 Paris, France
| | - Christophe Tribet
- Ecole
Normale Supérieure, Département de Chimie, UMR8640 CNRS-ENS-UPMC, 24 rue Lhomond, F-75005 Paris, France
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Covis R, Desbrieres J, Marie E, Durand A. Dilational rheology of air/water interfaces covered by nonionic amphiphilic polysaccharides. Correlation with stability of oil-in-water emulsions. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.09.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Inprakhon P, Panlawan P, Pongtharankul T, Marie E, Wiemann LO, Durand A, Sieber V. Toward one-pot lipase-catalyzed synthesis of poly(ɛ-caprolactone) particles in aqueous dispersion. Colloids Surf B Biointerfaces 2014; 113:254-60. [DOI: 10.1016/j.colsurfb.2013.09.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2013] [Revised: 09/04/2013] [Accepted: 09/05/2013] [Indexed: 12/01/2022]
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Panlawan P, Luangthongkam P, Wiemann LO, Sieber V, Marie E, Durand A, Inprakhon P. Lipase-catalyzed interfacial polymerization of ω-pentadecalactone in aqueous biphasic medium: A mechanistic study. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcatb.2012.11.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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van Dongen SFM, Maiuri P, Marie E, Tribet C, Piel M. Triggering cell adhesion, migration or shape change with a dynamic surface coating. Adv Mater 2013; 25:1687-1691. [PMID: 23355329 DOI: 10.1002/adma.201204474] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 11/30/2012] [Indexed: 06/01/2023]
Abstract
There's an APP for that: cell-repellent APP (azido-[polylysine-g-PEG]) is used to create substrates for spatially controlled dynamic cell adhesion. The simple addition of a functional peptide to the culture medium rapidly triggers cell adhesion. This highly accessible yet powerful technique allows diverse applications, demonstrated through tissue motility assays, patterned coculturing and triggered cell shape change.
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Affiliation(s)
- Stijn F M van Dongen
- École Normale Supérieure, Department of chemistry, UMR 8640 CNRS-ENS-UPMC, Paris, France.
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Covis R, Ladaviere C, Desbrieres J, Marie E, Durand A. Synthesis of water-soluble and water-insoluble amphiphilic derivatives of dextran in organic medium. Carbohydr Polym 2013; 95:360-5. [PMID: 23618280 DOI: 10.1016/j.carbpol.2013.03.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 02/15/2013] [Accepted: 03/03/2013] [Indexed: 11/18/2022]
Abstract
Hydrophobically modified dextrans were prepared by reacting native polysaccharide with 1,2-epoxydodecane in dimethylsulfoxide. Epoxide oligomerization was shown to occur as a secondary reaction when hydroxide ions were used as base catalysts. By adjusting the amount of epoxide in the feed, dextran derivatives with degrees of substitution (DS) between 0% and 164% were obtained. Polymers with DS above 100% were readily soluble in organic solvents like tetrahydrofuran, dioxane and water-saturated chloroform and dichloromethane. Their solution properties in organic solvent were characterized by capillary viscometry. Water-soluble derivatives were compared to other amphiphilic dextrans obtained using a heterogeneous modification in aqueous medium. The effect of modification conditions on substitution pattern was evidenced.
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Affiliation(s)
- Rudy Covis
- CNRS, LCPM, FRE3564, Nancy F-54001, France
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Adamczak M, Koleganova N, Nyengaard JR, Ritz E, Wiecek A, Slabiak Blaz N, Yi Chun DX, Alexandre H, Sandrine GS, Olivier T, Isabelle E, Christophe L, Guy T, Pierre Francois W, Jean-Philippe R, Yvon L, Eric R, Muller-Krebs S, Muller-Krebs S, Weber L, Tsobaneli J, Reiser J, Zeier M, Schwenger V, Tinel C, Samson M, Bonnotte B, Mousson C, Machcinska M, Machcinska M, Bocian K, Wyzgal M, Korczak-Kowalska G, Ju MK, Huh KH, Park KT, Kim SJ, Cho BH, Kim CD, So BJ, Leee S, Kang CM, Joo DJ, Kim YS, Bocian K, Zarzycki M, Sobich A, Korczak-Kowalska G, Matsuyama M, Hase T, Yoshimura R, Koshino K, Sakai K, Suzuki T, Nobori S, Ushigome H, Brikci-Nigassa L, Chargui J, Touraine JL, Yoshimura N, Cantaluppi V, Medica D, Figliolini F, Migliori M, Mannari C, Dellepiane S, Quercia AD, Randone O, Tamagnone M, Messina M, Manzione AM, Ranghino A, Biancone L, Segoloni GP, Camussi G, Turk TR, Zou X, Rauen U, De Groot H, Amann K, Kribben A, Eckardt KU, Bernhardt WM, Witzke O, Lidia G, Wouter C, Yvon L, Eric A, Yann LM, Guy T, Christian N, Marie E, Pierre M, Zineb A, Miriana D, Annick M, Marc A, Daniel A, Wornle M, Ribeiro A, Motamedi N, Grone HJ, Cohen CD, Schlondorff D, Schmid H, Teplan V, Banas M, Banas B, Steege A, Bergler T, Kruger B, Schnulle P, Yard B, Kramer BK, Hoger S, Xavier MP, Sampaio-Norton S, Gaiao S, Alves H, Oliveira G, Xavier MP, Sampaio-Norton S, Gaiao S, Alves H, Oliveira G, Xavier MP, Sampaio-Norton S, Gaiao S, Alves H, Oliveira G, Zaza G, Rascio F, Pontrelli P, Granata S, Rugiu C, Grandaliano G, Lupo A, Wohlfahrtova M, Wohlfahrtova M, Brabcova I, Balaz P, Janousek L, Lodererova A, Honsova E, Wohlfahrt P, Viklicky O, Grabner A, Grabner A, Kentrup D, Edemir B, Sirin Y, Pavenstadt H, Schober O, Schlatter E, Schafers M, Schnockel U, Reuter S, Rascio F, Pontrelli P, Accetturo M, Gigante M, Gigante M, Tataranni T, Zito A, Schena A, Schena FP, Stallone G, Gesualdo L, Grandaliano G, Maillard N, Masson I, Lena A, Manolie M, Eric A, Christophe M, Lassen CK, Keller AK, Moldrup U, Bibby BM, Jespersen B, Cvetkovic T, Velickovic Radovanovic R, Pavlovic R, Djordjevic V, Vlahovic P, Stefanovic N, Sladojevic N, Ignjatovic A, Rong S, Menne J, Haller H, Suszdak P, Tomczuk P, Gueler F, Nelli S, Sara D, Salma EK, Naoufal M, Tarik M, Mohamed Z, Guislaine M, Mohamed Gharbi B, Benyounes R, Lu X, Rong S, Shushakova N, Menne J, Kirsch T, Haller H, Gueler F, Bockmeyer CL, Bockmeyer CL, Ramackers W, Wittig J, Agustian PA, Klose J, Dammrich ME, Kreipe H, Brocker V, Winkler M, Becker JU, Agustian PA, Bockmeyer CL, Wittig J, Becker JU, Bockmeyer CL. Transplantation - basic. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Kaewprapan K, Inprakhon P, Marie E, Durand A. Enzymatically degradable nanoparticles of dextran esters as potential drug delivery systems. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2012.01.030] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kaewprapan K, Baros F, Marie E, Inprakhon P, Durand A. Macromolecular surfactants synthesized by lipase-catalyzed transesterification of dextran with vinyl decanoate. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.12.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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van Dongen SFM, Janvore J, van Berkel SS, Marie E, Piel M, Tribet C. Reactive protein-repellent surfaces for the straightforward attachment of small molecules up to whole cells. Chem Sci 2012. [DOI: 10.1039/c2sc20652h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Galindo-Alvarez J, Le KA, Sadtler V, Marchal P, Perrin P, Tribet C, Marie E, Durand A. Enhanced stability of nanoemulsions using mixtures of non-ionic surfactant and amphiphilic polyelectrolyte. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.08.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kaewprapan K, Wongkongkatep J, Panbangred W, Phinyocheep P, Marie E, Durand A, Inprakhon P. Lipase-catalyzed synthesis of hydrophobically modified dextrans: Activity and regioselectivity of lipase from Candida rugosa. J Biosci Bioeng 2011; 112:124-9. [DOI: 10.1016/j.jbiosc.2011.04.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 04/12/2011] [Accepted: 04/15/2011] [Indexed: 11/28/2022]
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Hansali F, Poisson G, Wu M, Bendedouch D, Marie E. Miniemulsion polymerizations of n-butyl cyanoacrylate via two routes: towards a control of particle degradation. Colloids Surf B Biointerfaces 2011; 88:332-8. [PMID: 21802908 DOI: 10.1016/j.colsurfb.2011.07.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Revised: 06/15/2011] [Accepted: 07/05/2011] [Indexed: 11/17/2022]
Abstract
This study aimed at determining the influence of the mechanism of polymerization on the molar mass and degradation of poly(n-butyl cyanoacrylate) (PBCA) nanoparticles obtained by miniemulsion polymerization. Therefore, nanoparticles of poly(n-butyl cyanoacrylate) were synthesized via radical and/or anionic miniemulsion polymerization stabilized by Brij®78, a POE based surfactant. Polymerization conditions had little influence on the final diameter while it severely affected the final molar masses of PBCA. An increase of the temperature and of the pH of the continuous phase led to higher molar masses. A further increase was observed when a radical initiator was added in the monomer. The evolution of the molar mass of the synthesized poly(n-butyl cyanoacrylate) was followed as a function of time at pH 7.4 by Size Exclusion Chromatography. As expected, the degradation kinetics strongly depended on the polymerization mechanism (anionic or radical).
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Affiliation(s)
- F Hansali
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568 CNRS-Nancy University, Nancy, France
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Chiewpattanakul P, Phonnok S, Durand A, Marie E, Thanomsub BW. Bioproduction and anticancer activity of biosurfactant produced by the dematiaceous fungus Exophiala dermatitidis SK80. J Microbiol Biotechnol 2010; 20:1664-1671. [PMID: 21193821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A new biosurfactant producer was isolated from palm-oilcontaminated soil and later identified through morphology and DNA sequencing as the yeast-like fungus Exophiala dermatitidis. Biosurfactant production was catalyzed by vegetable oil, supplemented with a basal medium. The culture conditions that provided the biosurfactant with the highest surface activity were found to be 5% palm oil with 0.08% NH4NO3, at a pH of 5.3, with shaking at 200 rpm, and a temperature of 30 degrees C for a 14-day period of incubation. The biosurfactant was purified, in accordance with surfactant properties, by solvent fractionation using silica gel column chromatography. The chemical structure of the strongest surface-active compound was elucidated through the use of NMR and mass spectroscopy, and noted to be monoolein, which then went on to demonstrate antiproliferative activity against cervical cancer (HeLa) and leukemia (U937) cell lines in a dose-dependent manner. Interestingly, no cytotoxicity was observed with normal cells even when high concentrations were used. Cell and DNA morphological changes, in both cancer cell lines, were observed to be cell shrinkage, membrane blebbling, and DNA fragmentation.
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Affiliation(s)
- Paramaporn Chiewpattanakul
- Laboratoire de Chimie Physique Macromoleculaire CNRS-Nancy University, ENSIC, 1 rue Grandville, BP 20451, F-54001 Nancycedex, France
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Schuhmacher A, Chevreux L, Marie E, André-Botté C, Tinard X, Schneider T. Évolution de la cession des CGR entre 2002 et 2009 au sein de l’établissement de transfusion sanguine Lorraine-Champagne. Transfus Clin Biol 2010. [DOI: 10.1016/j.tracli.2010.09.144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Frochot C, Mascherin M, Haumont A, Viriot ML, Marie E. Fluorescence spectroscopy as a non invasive tool to follow in situ the polymerization in miniemulsion. J Appl Polym Sci 2010. [DOI: 10.1002/app.32511] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Chiewpattanakul P, Covis R, Vanderesse R, Thanomsub B, Marie E, Durand A. Design of polymeric nanoparticles for the encapsulation of monoacylglycerol. Colloid Polym Sci 2010. [DOI: 10.1007/s00396-010-2216-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Durand A, Marie E. Macromolecular surfactants for miniemulsion polymerization. Adv Colloid Interface Sci 2009; 150:90-105. [PMID: 19660729 DOI: 10.1016/j.cis.2009.07.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2009] [Revised: 06/30/2009] [Accepted: 07/01/2009] [Indexed: 11/26/2022]
Abstract
The use of polymeric surfactants as stabilizers in miniemulsion polymerization was reviewed. The structural characteristics of reported polymeric surfactants were detailed and compared. The concept of multi-functional polymeric surfactants was evidenced. The specificities brought by polymeric surfactants in the process of miniemulsion polymerization in comparison to molecular surfactants were analysed for the stability of the initial monomer emulsion, polymerization kinetics and characteristics of the obtained latexes. The contribution of polymeric surfactants to the control of the characteristics of the obtained nanoparticles was detailed with regard to the nature of the core material and to the surface coverage. Polymeric surfactants can be seen as powerful tools for the design of original nanoparticles. On the basis of the available data, possible research topics are suggested.
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Wu M, Frochot C, Dellacherie E, Marie E. Well-Defined Poly(butyl cyanoacrylate) Nanoparticles via Miniemulsion Polymerization. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/masy.200950705] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Wu M, Dellacherie E, Durand A, Marie E. Poly(n-butyl cyanoacrylate) nanoparticles via miniemulsion polymerization. 2. PEG-based surfactants. Colloids Surf B Biointerfaces 2009; 69:147-51. [DOI: 10.1016/j.colsurfb.2008.10.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Revised: 09/30/2008] [Accepted: 10/01/2008] [Indexed: 10/21/2022]
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Nouvel C, Raynaud J, Marie E, Dellacherie E, Six JL, Durand A. Biodegradable nanoparticles made from polylactide-grafted dextran copolymers. J Colloid Interface Sci 2009; 330:337-43. [DOI: 10.1016/j.jcis.2008.10.069] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2008] [Revised: 10/27/2008] [Accepted: 10/28/2008] [Indexed: 11/29/2022]
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Rotureau E, Raynaud J, Choquenet B, Marie E, Nouvel C, Six JL, Dellacherie E, Durand A. Application of amphiphilic polysaccharides as stabilizers in direct and inverse free-radical miniemulsion polymerization. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2008.06.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Raynaud J, Choquenet B, Marie E, Dellacherie E, Nouvel C, Six JL, Durand A. Emulsifying Properties Of Biodegradable Polylactide-Grafted Dextran Copolymers. Biomacromolecules 2008; 9:1014-21. [DOI: 10.1021/bm701101n] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Raynaud
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568, CNRS-Nancy-University, ENSIC, BP 20451, 54001 Nancy Cedex, France
| | - B. Choquenet
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568, CNRS-Nancy-University, ENSIC, BP 20451, 54001 Nancy Cedex, France
| | - E. Marie
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568, CNRS-Nancy-University, ENSIC, BP 20451, 54001 Nancy Cedex, France
| | - E. Dellacherie
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568, CNRS-Nancy-University, ENSIC, BP 20451, 54001 Nancy Cedex, France
| | - C. Nouvel
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568, CNRS-Nancy-University, ENSIC, BP 20451, 54001 Nancy Cedex, France
| | - J.-L. Six
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568, CNRS-Nancy-University, ENSIC, BP 20451, 54001 Nancy Cedex, France
| | - A. Durand
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568, CNRS-Nancy-University, ENSIC, BP 20451, 54001 Nancy Cedex, France
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Giraud F, Frikha MR, Richomme C, Ezingeard E, Marie E, Roger T, Bertrand J. Intérêt de la circulation extra-corporelle dans un protocole expérimental « réaliste » du traitement de l’arrêt cardiaque. Ing Rech Biomed 2007. [DOI: 10.1016/s1297-9562(07)78730-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rotureau E, Leonard M, Marie E, Dellacherie E, Camesano T, Durand A. From polymeric surfactants to colloidal systems (1): Amphiphilic dextrans for emulsion preparation. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2006.01.044] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Bautin N, Fournier C, Marie E, Robin S, Neviere R, Wallaert B. [Exercise performance of patients with alveolar proteinosis]. Rev Mal Respir 2005; 22:943-50. [PMID: 16215530 DOI: 10.1019/200530119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
INTRODUCTION Cardiopulmonary exercise testing (CPET) is used to evaluate the severity of interstitial lung diseases, particularly when lung function is normal. The aim of this study was to analyse exercise capacity of patients with alveolar proteinosis. METHODS We studied 7 patients undergoing alveolar proteinosis (aged 38 +/- 5 years), Three patients complained of exertional dyspnoea, 2 had a reduced vital capacity and 5 had a DLCO of less than 75% predicted. CPET was performed on a bicycle ergometer using a standard incremental protocol. RESULTS CPET was symptom limited for all patients.. At peak exercise, VO2 was severely reduced (19.5 +/- 5.2 ml/kg/min, 58 +/- 9%). All patients developed hyperventilation. Ventilatory reserve was 42 +/- 11% of MMV, and dead space ratio (Vd/Vt) reached 0.29 +/- 0.05. Cardio-circulatory adaptation was normal (maximum heart rate 83 +/- 9%; VO2/heart rate 70 +/- 10%). Six patients exhibited gas exchange abnormalities at peak exercise (including 4 patients having a normal vital capacity): P(A-a)O2 56 +/- 18mm Hg; PaO2 65 +/- 18 mm Hg. CONCLUSION Patients undergoing alveolar proteinosis have severe impairment of aerobic capacity and gas exchange on exercise. CPET appears to be useful for therapeutic management.
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Affiliation(s)
- N Bautin
- Clinique des maladies respiratoires, Hôpital Calmette, CHRU Lille, France
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Affiliation(s)
- T Gey
- Service de Pneumologie, Centre Hospitalier de Valenciennes, Valenciennes, France
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Marie E, Chevalier Y, Eydoux F, Germanaud L, Flores P. Control of n-alkanes crystallization by ethylene–vinyl acetate copolymers. J Colloid Interface Sci 2005; 290:406-18. [PMID: 15950981 DOI: 10.1016/j.jcis.2005.04.054] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2004] [Revised: 04/07/2005] [Accepted: 04/19/2005] [Indexed: 10/25/2022]
Abstract
The crystallization of paraffins from their solution at low temperature was investigated in the presence of ethylene-vinyl acetate (EVA) copolymers that allow the control of the size of the crystals. Depending on the type of solvent and distribution of the paraffin lengths, the mechanisms of crystal formation and growth are different. Precipitation of the EVA prior to the paraffins leads to the nucleation of a large number of crystals, whereas the adsorption of EVA on the surface of the growing crystals slows down the crystal growth. EVA can act either as a nucleating agent or as a growth inhibitor. These two mechanisms were identified from the analysis of the temperature of crystallization (cloud point), the chemical composition of the crystals, and the observations of the crystal habit. The EVA was able to co-crystallize with the paraffins in crystals of an orthorhombic structure and the melting enthalpies of the crystalline paraffin did not depend significantly on their neighborhood. The energies of interaction between the different paraffinlike components are close to each other, so that minor changes of the experimental conditions may lead to dramatic effects. This is the basic rationale for the large behavioral diversity observed in these systems.
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Affiliation(s)
- Emmanuelle Marie
- Laboratoire des Matériaux Organiques à Propriétés Spécifiques, UMR 5041 CNRS, Université de Savoie, BP 24, F-69390 Vernaison, France
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Durand A, Marie E, Rotureau E, Leonard M, Dellacherie E. Amphiphilic polysaccharides: useful tools for the preparation of nanoparticles with controlled surface characteristics. Langmuir 2004; 20:6956-6963. [PMID: 15274610 DOI: 10.1021/la0490341] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Polymeric surfactants obtained by hydrophobic modification of dextran are used as stabilizers for oil-in-water emulsions. The kinetics of interfacial tension decrease is studied as a function of polymer structural characteristics (degree of hydrophobic substitution) and at various polymer concentrations. Several hydrocarbon oils, either aliphatic (octane, decane, dodecane, and hexadecane) or aromatic (styrene), are tested. Kinetics exhibits the same general trends no matter which oil or polymer is considered. The emulsifying properties of the polymeric surfactants are illustrated by the preparation of oil-in-water emulsions. The droplet size at the preparation is correlated to the amount of oil and to the polymer concentration in the aqueous phase. For low polymer/oil ratios, it is shown that the droplet size is limited by the initial amount of polymer. On the contrary, for high polymer/oil ratios, the droplet size seems to level down, indicating that other parameters become predominant. Emulsion aging occurs by Ostwald ripening, and it is demonstrated that the theoretical equation of Lifshitz, Slyozov, and Wagner (LSW) correctly describes the experimental results. The nature of the oil has important effects on emulsion aging, as described by the LSW equation. The aging of emulsions containing oil mixtures is quantitatively described on the basis of the results with pure oils. The influence of polymer chemical structure can be conveniently correlated to interfacial tension results through the LSW equation. On the contrary, the influence of oil volume fraction seems to be overestimated by the usual correction factor, k(phi). The effect of temperature on emulsion aging is finally examined. Miniemulsions stabilized with dextran derivatives are used for the radical polymerization of styrene. Following this procedure, polysaccharide-covered polystyrene nanoparticles are prepared and characterized (size and surface coverage). The size of the particles is directly correlated to that of the initial droplets for styrene volume fractions around 10%. On the contrary, for initial styrene volume fractions around 20%, particles exhibit a larger size than the initial droplets, indicating that coalescence processes take place during polymerization. The amount of dextran at the surface of the particles is determined and compared to the adsorbed amounts resulting from emulsion preparation.
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Affiliation(s)
- A Durand
- Laboratoire de Chimie Physique Macromoléculaire, UMR CNRS-INPL 7568, Groupe ENSIC, BP 451, 54001 Nancy Cedex, France.
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Chevalier Y, Fixari B, Brunel S, Marie E, De Guio P. Review: The adsorption of functional polymers from their organic solutions: applications to fuel additives. POLYM INT 2004. [DOI: 10.1002/pi.1438] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Marie E, Chevalier Y, Brunel S, Eydoux F, Germanaud L, Flores P. Settling of paraffin crystals in cooled middle distillate fuels. J Colloid Interface Sci 2004; 269:117-25. [PMID: 14651903 DOI: 10.1016/j.jcis.2003.07.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The mechanism of action of additives that control the sedimentation of paraffin crystals after their crystallization in model diesel oil has been studied by means of a new experimental approach. The chemical analysis of the crystals and detailed measurements of the sedimentation phenomenon give new insights into this complex process. Thus, the wax antisettling additives used for preventing wax crystal sedimentation adsorb at the surfaces of wax particles and provide them with enhanced colloidal stability. The settling rate is not related to the size of the crystals or the viscosity of the liquid medium, but to the ability of the additives to prevent the aggregation of wax crystals. The reported methodology makes it possible to investigate the fundamental mechanisms, but also to evaluate structure-activity relationships of the various additives used in the petroleum industry.
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Affiliation(s)
- Emmanuelle Marie
- Laboratoire des Matériaux Organiques à Propriétés Spécifiques, UMR 5041 CNRS, Université de Savoie, BP 24, F-69390 Vernaison, France
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Affiliation(s)
- Emmanuelle Marie
- Max Planck Institute of Colloids and Interfaces, Forschungscampus Golm, D-14424 Potsdam, Germany
| | - Regina Rothe
- Max Planck Institute of Colloids and Interfaces, Forschungscampus Golm, D-14424 Potsdam, Germany
| | - Markus Antonietti
- Max Planck Institute of Colloids and Interfaces, Forschungscampus Golm, D-14424 Potsdam, Germany
| | - Katharina Landfester
- Max Planck Institute of Colloids and Interfaces, Forschungscampus Golm, D-14424 Potsdam, Germany
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Sakly N, Touzi H, Ouada H, Jaffrezic-Renault N, Marie E, Chevalier Y. Electrical characterization of a new polymeric ion-exchanging membrane for the chemical detection of anions. Materials Science and Engineering: C 2002. [DOI: 10.1016/s0928-4931(02)00055-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Marie E, Landfester K, Antonietti M. Synthesis of chitosan-stabilized polymer dispersions, capsules, and chitosan grafting products via miniemulsion. Biomacromolecules 2002; 3:475-81. [PMID: 12005517 DOI: 10.1021/bm015634s] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The potential of chitosan as an emulsion stabilizer is combined with the miniemulsion technique to generate oil droplets, hollow capsules, and latex particles in the diameter range of 100-300 nm carrying a functional biopolymer surface. It turned out that chitosan alone, independent of its molecular weight, is just moderately efficient, which is speculatively attributed to its stiff polysaccharide structure. The addition of biocompatible costabilizers with higher flexibility either to the oil phase or to the water phase, such as Jeffamine or Gluadin (a peptide), eliminates these deficiencies, and very small nanocapsules made of biopolymer hybrids can be obtained. NMR analysis shows that the costabilizer is effectively grafted/cross-linked to the chitosan which makes the miniemulsion route also effective for the modification of hard-to-handle, amphiphilic biopolymers either from the water or from the oil phase.
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Affiliation(s)
- Emmanuelle Marie
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg, D-14424 Potsdam-Golm, Germany
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